I could have defined my drinking exactly like that when I was 20. Even when I knew full well that I was most DEFINITELY an alcoholic, I succeeded in life (no legal issues, straight A's through undergrad and grad school, successful career, marriage, nice home etc), but it was sure a juggling act. Fast forward a little bit and my drinking became more often, in larger quantities, for many reasons. I SWORE I didn't "need" it, I wasn't physically addicted until the very end (you do NOT want to go there, trust me!), and I had put all of those 'successes', not to mention my self worth, on the line.
I guess if you can take it or leave it, and don't feel you need it, you'll have absolutely no problem never drinking again! If you do find that's difficult, there might be some stuff there to take a look at.